Stickers by type:

3D Stickers
Adhesive foile
Stickersheets
round / eliptic
scratch resistant
Transparent
industrial
removable stickers
stickers without adhesion
Behind-Glass (read from outside)
Express-Stickers
Postcards
Matt stickers
shaped stickers
die-cut stickers
Neon / Glow Stickers
Glow-In-The-Dark Stickers
Effect lacquer / finish
re-usable stickers

Stickers by use:

Car / bumper
shipping / nautical
Fan-Stickers
Window
Company Logo
Hints / Guide Signs
Machine Labels
Merchandise
Seals & Security
Toy-Safe stickers (EG regulation)
Tea & Coffee sales
Maintainance & Service
Advertisers
Postcards
Product labels
QR- and Barcodes
Serial labels
Clubs / Teams / Organisations

Stickers by feature

round
oval
rectangle
any shape
stratch resistant
transparent
water proof

Services and Stickers:

Packaging / Converting
Express-Services
Neon / Glow
Mailings
Corporate Colors
Sorting